1、SMPTE RECOMMENDED PRACTICE RP 179-2002 Revision of RP 179-1994 Dialect Specification of Page-Line Directory Index for Television, Audio and Film Time and Control Code for Video-Assisted Film Editing Page 1 of 13 pages 1 Scope L This practice specifies a method of coding film position, film frame to
2、video frame phase relationship, transfer sync points, and production related data into binary groups of SMPTE time and control code. The dialect specified defines the structure of directory page-lines OAh to OFh (page O, lines 10 through 15), 1Ah to 1 Fh (page 1, lines 10 through 15), 2Fh (page 2, l
3、ine 15), and Doh to EFh (pages 13 and 14, lines O through 15). This conforms to the muitiplexing structure specified in ANSKMPTE 262M. The page-line directory index, located in binary groups 8 and 7 of each time code frame, fully specifies the type of data stored in the remaining binary groups of th
4、at frame. The encoding method is suitable to both linear time code (LTC) and to vertical interval time code (VITC). 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this practice. At the time of publication, the edition
5、s indicated were valid. All standards are subject to revision, and parties to agreements based on this practice are encouraged to investigate the possibility of applying the most recent edition of the standards indicated below. ANSVSMPTE 262M-1995, Television, Audio and Film - Binary Groups of Time
6、and Control Codes - Storage and Transmission of Data SMPTE 12M-1999, Television, Audio and Film - Time and Control Code 3 Data structure The page-line directory index, located in binary groups 8 and 7 of each time code frame, fully specifies the type of data stored in the remaining binary groups of
7、that frame. Data are stored in the binary groups of tirne and control code as single-frame and multiframe messages. This structure is described in ANSVSMPTE 262M. The page-line directory index, shown throughout this practice as a two-digit hexadecimal number, specifies the data stored in the remaini
8、ng binary groups of time code frame. 3.1 Datatypes r The transfer of film to video with accompanying audio may be described by a dynamic frame-by-frame definition of the film to video transfer relationship and/or by a sync point and transfer parameters. The application will determine which combinati
9、on of data is used. Approved August 8,2002 Copyright Q 2002 by THE SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 595 W. Hartsdaie Ave., White Plains, NY 10607 (914) 761-1100 RP 179-2002 3.2 Dynamic transfer data Dynamic transfer data consists of information such as film edge numbers which are c
10、hanging throughout the transfer. These data may be encoded frame by frame as detailed in clause 4. 3.3 Static production data Static production data include items such as scene, roll, and take numbers which remain constant for a section of a transfer. The data may be encoded at the beginning, before
11、 the active portion of the transfer, or as indicated by the application. Static data types and their encoding are detailed in clause 5. 3.4 Sync point data Sync point data definea common point among sets of dynamically changing data. Where the relationship between dynamically changing sets of data i
12、s defined and remains constant, other points prior to and after the sync point may be calculated. The data and their encoding are detailed in clause 6. 4 Dynamic film transfer data 4.1 Bit assignment The manufacturers edge number data are specified in the appropriate SMPTE standard for the film gaug
13、e. The frame offset and the units and tens digits of edge number are encoded into binary groups 1 through 4 of each frame. The frame offset is the positive frame offset from the identified edge number location. It is encoded as two BCD nibbles. The range of values for the frame offset is from zero t
14、o a value dependent on the film gauge and exposure format. Since the frames tens digit will not exceed the value three, only two bits are required. The remaining two bits in binary group 2 may be used to define the film-to-video field pulldown. The remaining data is multiplexed into binary groups 6
15、and 5 with the page-line index in binary groups 8 and 7. The data encoded into binary groups shall be assigned as shown in table 1. 4.1.1 Field 1 update flag For the transfer of film media to video, the field one update flag shall be a one if the film frame changed at the beginning of video field on
16、e. Table 1 - Binary group bit assignment I LTC bits VITC bits Binaw orow Assignat ion I 4-7 6-9 1 Frames units 12-1 3 14 15 20-23 28-31 36-39 44-47 52-55 60-63 16-1 7 2 Frames tens 18 2 Field 2 update flag 19 2 Field 1 update flag 26-29 3 Edge number units 36-39 4 Edge number tens 46-49 5 Multiplexe
17、d digit 1 56-59 6 Multiplexed digit 2 66-69 7 Line index 76-79 8 Page index Page 2 of 13 pages RP 179-2002 4.1.2 Field 2 update flag For the transfer of film media to video, the field two update flag shall be a one if the film frame changed at the beginning of video field two. When this flag is a on
18、e, it identifies the video frame as a hybrid of two film frames. 4.2 Multiplexed data identification The page-line index defines the contents of the multiplexed digits as shown in table 2. These data are multiplexed into binary groups 6 and 5 with the page-line index in binary groups 8 and 7. 4.3 Ma
19、nufacturers edge number The manufacturers edge number consists of a manufacturers identification code, a film emulsion type code, a batch number, and an edge number. This number comprises 14 BCD encoded digits. A manufacturers edge number may be replaced by an edge code and this shall be indicated b
20、y setting the manufacturers identification code to FF(hex). The frame offset from the edge number location and the two least significant digits of the edge number are encoded on each frame. The remaining digits of the manufacturers edge code are multiplexed. 4.4 Footage and footage frame offset The
21、footage count and an off set from the footage mark are multiplexed as BCD encoded digits. 4.5 Film roll number The film roll number is multiplexed as hexadecimal encoded digits. 4.6 Transfer data The transfer data byte conveys specific information about the film transfer. The interpretation of this
22、data byte is shown in figure 1. 4.6.1 Status bit definition The individual bits of a 4-bit binary coded nibble define the status of film transfer data. 4.6.1.1 Edge number valid This bit is set to one if the manufacturers edge number is valid. 4.6.1.2 Edge number contrary count direction This bit is
23、 set to one if the edge number count direction is contrary to count direction of the time address. 4.6.2 Event code definition A 4-bit hexadecimal coded nibble defines events which may occur during a film-to-video transfer. Only one event may be identified at a time. If two events occur simultaneous
24、ly, the event with the higher number shall be encoded first unless defined otherwise by the application. RP 179-2002 BINARY GROUP 6 Table 2 - Multiplexed data identification BINARY GROUP 5 7 6 I 5 4 I 3 I 2 I 1 7 6 5 4 O 1 = Edge number valid 1 = Edge number contrary count direction Unassigned Unass
25、igned 2 Event code Description O 1 2 3 4 5 6 7 8 9 10 A 11 B 12 c 13 D 14 E 15 F Unassigned Speed lock achieved Zero frame crossing Physical film splice Edge number discontinuity Speed lock lost Full stop Edge number status change GPI trigger Unassigned U nas si g ned U hassi g ned U nassi g ned Una
26、ssigned Unassigned Clear multiplexed data Figure 1 -Transfer data byte Page 4 of 13 pages RP 179-2002 4.6.2.1 Speed lock achieved The event code is set equal to one to indicate that the film speed has achieved stable play speed. 4.6.2.2 Zero frame crossing The event code is set equal to two to indic
27、ate the passage of a designated film frame. This is normally associated by an absolute footage count being equal to zero. 4.6.2.3 Physical film splice The event code is set equal to three to indicate that a film splice has been detected. 4.6.2.4 Edge number discontinuity The event code is set equal
28、to four to indicate that a discontinuity in the edge number count has been detected. 4.6.2.5 Speed lock lost The event code is set equal to five to indicate that the film speed has left play speed. 4.6.2.6 Full stop The event code is set equal to six to indicate that the film speed has come to a ful
29、l stop. 4.6.2.7 Edge code status change The event code is set equal to seven to indicate that the edge number status has changed. The edge number status as described in 4.6.1.1 indicates the condition after the change. 4.6.2.8 GPI trigger The event code is set equal to eight to indicate that an exte
30、rnal trigger has occurred. 4.6.2.9 Unassigned The event codes O and 9 through 15 are unassigned and reserved for future definition. 4.7 Muitiplexing order As each frame is uniquely defined by its page-line index, no special order is required for multiplexing data. The order and repetition of data sh
31、all be as defined by the application. 5 Directory page D - Static production data All of the production data are encoded as standard 7-bit IS0 character or BCD numbers. The format for most types of data is basically the same. The information multiplexed in the binary groups of time code is determine
32、d by the application. One item or all of them may be included. Data are stored in the binary groups of time and control code as single-frame and multiple-frame messages (see table 3). Page 5 of 13 pages RP 179-2002 Table 3 - Directory page D, lines O to F definitions Binary group 8 7 6 5 4 3 2 1 D O
33、 Character 1 Character 2 Character 3 Scene Scene D 1 Character 4 Character 5 Character 6 Take D 2 Character 1 Character 2 Character 3 Video reel Video reel Film roll Film roll Sound roll Sound roll Character 3 D 3 Character 1 Character 2 D 4 Character 4 Character 5 Character 6 D 5 Character 1 Charac
34、ter 2 Character 3 D 6 Character 4 Character 5 Character 6 D 7 Character 1 Character 2 Character 3 D 8 Character 4 Character 5 Character 6 D 9 Character 1 Character 2 Character 3 Production number Production number D A Character 4 Character 5 Character 6 Transfer date D B Year Month Day Tens Units Te
35、ns Units Tens Units D C Type Byte count C h ec ks u m Message prefix Message string D D Character 1 Character 2 Character 3 Message suffix D E Type Byte count Checks um Unassigned D F Character 1 Character 2 Character 3 5.1 Page-line DO, D1- Scene (2 frames) The scene data are encoded in two frames
36、identified by page-lines DO and D1. Six IS0 characters are provided for scene. 5.2 Page-line D2 -Take (1 frame) The take data are encoded in one frame identified by page-line D2. Three IS0 chamcters are provided for take. 5.3 Page-lines D3, D4 - Video reel number (2 frames) The video reei number is
37、encoded in two frames identified by page-lines D3 and D4. Six IS0 characters are provided for the video reel number. 5.4 Page-lines D5, D6 - Film roll number (2frames) The film roll number is encoded in two frames identified by page-lines D5 and D6. Six IS0 characters are provided for the film roll
38、number. 5.5 Page-lines D7, D8 - Sound roll number (2 frames) The sound roll number is encoded in two frames identified by page-lines 07 and D8. Six IS0 characters are provided for the sound roll number. 5.6 Page-lines D9, DA - Production number (2 frames) The production number is encoded in two fram
39、es identified by page-lines D9 and DA. Six IS0 characters are provided for the production number. Page 6 Of 13 pages I RP 179-2002 5.7 Page-line DB - Date (1 frame) The date is encoded in one frame identified by page-line DB. Six BCD digits are provided for the date. 5.8 Page-lines DC, DD, and DE -
40、Message string (3 to 87 frames) A message string can be encoded in binary groups over a number of frames. It is identified by three different page-lines in the directory index. 5.8.1 Page-line DC Page-line DC is a message prefix that contains a checksum, a message specifier, and the byte count of th
41、e message to follow with a maximum of 255 IS0 characters. If the byte count is not known at the beginning of the message, then a zero shall be entered. 5.8.2 Page-line DD Page-line DD identifies a frame that contains three IS0 characters that are part of the message string. One to 85 frames, all ide
42、ntified by page-line DD, are sent for a message length of 1 to 255 characters. The byte count of this message is specified in the message prefix and again in the message suffix. 5.8.3 Page-line DE Page-line DE is a message suffix with the same content as the message prefi. The byte count must be sho
43、wn, and it cannot be zero unless the message length is actually zero. The suif indicates the end of the message string. 5.9 Page-line DF Page-line DF is unassigned (1 frame). 5.10 Message characters Up to three 8-bt characters may be stored in one frame. Each character may be an 8-bit binary charact
44、er, a 7-bit IS0 character with even parity, or may be divided into two 4-bit BCD or hex characters. Where there is space not filled in a message frame, the remaining characters shall be filled with nulls. 5.11 Checksum Emr detection may be provided for as an consequently, the page-line directory wil
45、l allow both to be encoded simultaneously. An ink edge code number is encoded in a sync point as follows (see table 4): Page-line E5: Binary groups 1 and 2 contain two format nibbles. These spec*w the type of film, the speed of transfer, and the film-to-video phase relationship at the sync point (se
46、e 6.4). Binary groups 3 and 4 specify the film sync point edge number frame offset. Binary groups 5 and 6 specify the film sync point ink edge number units and tens. Page-line E6: Binary groups 1 to 4 specify the film sync point edge number 3rd to 6th significant digits. Binary groups 5 and 6 define
47、 IS0 character 1 of the film sync point. Page-line E7: Binary groups 1 and 2 define IS0 character 2. Binary groups 3 and 4 define IS0 character 3. Binary groups 5 and 6 define IS0 character 4. Page-line E8: Binary groups 1 and 2 define IS0 character 5. Binary groups 3 and 4 define IS0 character 6. T
48、he most significant bit of binary group 4 is the key number flag bit. This eighth bit is always zero with a 7-bit IS0 character. Binary groups 5 and 6 define the sync point time code frames. Page-line E9: Binary groups 1 and 2 define the sync point time code seconds. Binary groups 3 and 4 define the
49、 sync point time code minutes. Binary groups 5 and 6 define the sync point time code hours. 6.3 Page-lines EA-EC - Film time code sync point (3 frames) A film time code sync point defines a specific frame relationship between a frame of the SMPTE time code that contains the multiplexed user bits and a specific frame of film with a film time code associated with it. Afilm time code number is encoded in a sync point as follows (see table 4 ): Page-line EA: Binary groups 1 and 2 contain two format nibbles. These specify the type of film, the speed of transfer, and the film-to-video pha
